Man, that does sound bad
Anyway, I don't know whether the Air Max are available in wide sizes. I'm kinda flat footed myself (that's what my orthopaedic says, at least) and they're nice to wear. Those are Air Max 90, and the guy at the shop told me that the Air Max One are a bit wider and use fabric isntead of leather, which makes them softer. I, personally, liked the 90 better, but there's some variety to be had. I'd assume that some of these are wider than others. The pair I've got isn't designated as a wide shoe, but they don't feel tight, at all... I can only recommend trying some on 👍
The primary reason they're so comfortable is probably the cushioning, I'd think. They're better at that than most running shoes I've tried - and those are generally too tight and look pretty awful.